Communication system and communication method

摘要

A plurality of communication lines are connected to a gateway. The gateway relays a communication message between the communication lines. A communication message input to the gateway from a first communication line out of the communication lines is defined as a first communication message. The gateway generates a communication message for relay. The communication message for relay contains first path information and second path information incorporated into the first communication message. The first path information indicates the first communication line. The second path information indicates the fact that the first communication message has been input to the gateway. Further, the gateway transfers the communication message for relay to at least one communication line different from the first communication line. The communication device determines the reliability of the received communication message based on the first path information and the second path information in the received communication message.

主权项

1. A communication system comprising at least one communication device and at least one gateway, wherein
the communication device is connected to communication lines and configured to perform communication using a communication message via the communication lines, the communication lines are connected to the gateway, and the gateway is configured to relay a communication message between the communication lines, a communication message input to the gateway from a first communication line out of the communication lines is defined as a first communication message, the gateway is configured to generate a communication message for relay, and the communication message for relay contains first path information and second path information incorporated into the first communication message, the first path information indicating the first communication line as bus path information of the first communication line, the second path information indicating the fact that the first communication message has been input to the gateway, the gateway is further configured to transfer the communication message for relay which includes the first path information and the second path information to at least one communication line different from the first communication line, the communication device is configured to determine the reliability of the received communication message based on the first path information and the second path information in the received communication message, the communication device is configured to verify the received communication message based on a path along which this communication message has passed such that the reliability of the received communication message is determined in real time and to further determine appropriateness of the bus path information contained in the first path information by using the second path information of the received communication message, and the communication message for relay includes information indicating whether the communication device receiving the communication message needs to determine the reliability of the received communication message based on the first path information and the second path information.